[BONUS]
Ren went next to Aimon's Cabin.
He had a guess that Aimon's disappearance was somehow connected to what's been going on, and he decided to visit his hut.
The door was locked, of course. It couldn't be opened without the necessary STR. However, it didn't say anything about magical damage, and Ren just blasted through it using a [Fire] spell.
He didn't cause a ruckus, though. It was just a simple fire that melted the knob and opened the door. Though he had the [Crystal Keys], he didn't want to waste them on something simple like this.
If there was a thief in the group, then they could open the door with their skill [Sleight of Hand] or their Thieves' tools that could be bought in any item shop.